Answer:
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n psychology, instinct approaches to motivation have faded because they lacked the goal of explanation in psychology.
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I'd say D. expert power because expert power is when an employee ( or in your case the teacher) has a high set of knowledge/skills that other employees do not posses. Which by the information above about this teacher's PhD and thier experience, I assume that this teacher must have expert power.
First search up what a lunar is then look in images and you should find your answer